Payment options include paying in United States Dollars (USD) or Australian dollars (AUD). If your currency is different, it will be converted to your currency with your payment provider. Payment is once only.
You can access the patterns as many times as you like after purchase. You can download and keep the patterns forever. But you must save them to your own computer/USB/Cloud storage. I can't guarantee lifetime access to the patterns if you haven't downloaded them, but you can access them for as long as they're available on the learning platform (and I plan for that to be a good long time, just can't say lifetime ;) ).